swift-基于自定义view的提示语

先上效果图：

IMG_0362.PNG

swift版本的提示语，我是完全按照OC的逻辑来编写的，实际上就是换了一种语法而已，相对OC来说，swift更为简洁、易读。
上代码：

import UIKit
class RHToast: UIView {
    let ScreentW = UIScreen.main.bounds.width
    let ScreentH = UIScreen.main.bounds.height
    let KScaleW = UIScreen.main.bounds.width/320.0
    let KScaleH = UIScreen.main.bounds.height/568.0
    var textLable = UILabel()
    override init(frame: CGRect) {
        super.init(frame: frame)
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    func initWithView (view:UIView,text:String,inDuration:CGFloat) ->UIView{
        var w = CGFloat(120)
        var h = CGFloat(ScreentH-64)
        let dic = NSDictionary(object: UIFont.systemFont(ofSize: 14*KScaleW), forKey: NSAttributedString.Key.font as NSCopying)
        let size = text.size(withAttributes: dic as? [NSAttributedString.Key : Any])
        if size.width > w-20 {
            if size.width < 200-20 {
                w = size.width + 20
                h = size.height + 20
            }else{
                w = 200
                let size1 = text.boundingRect(with:CGSize.init(width: w, height: h), options: .usesLineFragmentOrigin, attributes: dic as? [NSAttributedString.Key : Any], context: nil)
                if size1.height<ScreentH-64-20 {
                    h = size1.height+20
                }
            }
        }else{
            w = size.width + 20
            h = size.height + 20
        }
        self.frame = CGRect(x: (view.bounds.size.width-w)/2, y: (view.bounds.size.height-h)/2, width: w, height: h)
        self.layer.cornerRadius = 6
        self.alpha = 0
        self.backgroundColor = UIColor.init(white: 0, alpha: 0.8)
        
        self.textLable = UILabel.init(frame: CGRect(x: 10, y: 10, width: self.bounds.size.width-20, height: h-20))
        self.textLable.backgroundColor = UIColor.clear
        self.textLable.font = UIFont.systemFont(ofSize: 14*KScaleW)
        self.textLable.textColor = UIColor.white
        self.textLable.numberOfLines = 0
        self.textLable.textAlignment = .center
        self.textLable.lineBreakMode = .byCharWrapping
        self.textLable.text = text
        self.addSubview(self.textLable)
        view.addSubview(self)
        self.show(duration: inDuration)
        return self
    }
    func show(duration:CGFloat) -> Void {
        //简单动画
        UIView.animate(withDuration: 0.5, animations: {
            self.alpha = 1
        }, completion: nil)
        //定时器
        let timer = Timer.scheduledTimer(timeInterval: Double(duration), target: self, selector: #selector(closeToast), userInfo: nil, repeats: false)
        RunLoop.current.add(timer, forMode: .common)
    }
    @objc func closeToast() -> Void {
        UIView.animate(withDuration: 0.5, animations: {
            self.alpha = 0
        }) { (true) in
            self.removeFromSuperview()
        }
    }
}